Generating method and device, receiving method and device for dual-frequency constant envelope signal with four spreading signals

摘要

The application relates to a generating method and device, receiving method and device for a dual-frequency constant envelope multiplexed signal with four spreading signals. According to the method, the four baseband spreading signals s₁(t), s₂(t), s₃(t), s₄(t) can be modulated to a frequency f₁ and a frequency f₂ respectively, so as to generate the constant envelope multiplexed signal on a radio carrier frequency f_p=(f₁+f₂)/2, where the signals s₁(t) and s₂(t) are modulated on the frequency f₁ with carrier phases orthogonal to each other, the signals s₃(t) and s₄(t) are modulated on the frequency f₂ with carrier phases orthogonal to each other, f₁f₂. The method comprises: determining a power ratio allocated to the four baseband spreading signals s₁(t), s₂(t), s₃(t), s₄(t) in the constant envelope multiplexed signal; storing an additional phase lookup table, wherein the table includes additional phases of an in-phase baseband component I(t) and a quadrature-phase baseband component Q(t) of the constant envelope multiplexed signal; obtaining an additional phase θ of a segment of the current time by looking up the additional phase lookup table; and generating an in-phase baseband component I(t) and a quadrature-phase baseband component Q(t) of the constant envelope multiplexed signal, and generating the constant envelope multiplexed signal S_RF(t) based on the obtained additional phase θ.